Unable to redeem Apple Gift Card

this $25 gift card apple is valid for code not working.

Where did you purchase that gift card?

You have certainly received a proof of payment.

Go back to the store/seller and ask for your money back.

See this Apple article:  If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

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Card is not valid

Card has already been redeemed

Card is not activated

Code is unreadable

Code must be redeemed in a different country or region

Contact Apple Support -> Contact Apple Support.

Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support

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If you have a valid payment method on file, instead of buying or order an App Store & iTunes gift card, you can Add money to your Apple Account balance anytime, no gift card needed, see -> Apple Gift Card - Apple (UK)

If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK) 

If you are having problems redeeming a gift card, review the possible reasons and suggestions listed in this support article --> Card is not valid --> If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support